PY0160 "Y8 - 1923"

Visited Yellowstone National Park for the first time. A bucket-list item for me. Spent a few hours in Fort Yellowstone and the Mammoth Hot Springs visiting the museum, taking lots of pictures, and doing a few touristy things. Looked for a few benchmarks too.

Located at Fort Yellowstone near the very scenic Mammoth Hot Springs in Park County, Wyoming, this USC&GS mark lies adjacent to the walkway to the front steps of the Horace M. Albright Visitor Center.  The USC&GS mark stamped "Y8 - 1923" was found at 08:55, 24 July 2019 as described and in generally good condition. This is a high pedestrian traffic area and this mark gets regular visitors and viewings. Being right in front of one of the most prominent buildings in the vicinity, I'm sure it is well protected by the Fort & Park staff. Go to description is adequate to find the mark.

Published NAD83 coordinates are located about 109 feet westerly of the found WGS84 coordinates. WGS84 coordinates for the mark found by 3 minute occupation with 8 strong satellites and 1 WAAS satellite.

View Original Datasheet Here

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Found Details for Benchmark: PY0160

N 44° 58.580 W 110° 41.992 (WGS 84)

Altitude: 6276

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Published Details for Benchmark: PY0160

N 44° 58.583 W 110° 42.017 (NAD 83)

Altitude: 6243.78

Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED.

Location: In Park County, WY

Designation: Y 8

Marker Type: bench mark disk

Setting: set into the top of a round concrete monument

Stability: May hold, but of type commonly subject to surface motion.

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Documented History (by the NGS)

01 Jan 23 by CGS (MONUMENTED)

01 Jan 60 by NGS (GOOD)

DESCRIBED BY NATIONAL GEODETIC SURVEY 1960 IN MAMMOTH HOT SPRINGS. AT MAMMOTH HOT SPRINGS, 1 BLOCK SOUTHWEST OF THE POST OFFICE, 123 FEET SOUTHEAST OF THE CENTER LINE OF THE MAMMOTH HOT SPRINGS-NORRIS JUNCTION HIGHWAY, 20 FEET SOUTHWEST OF THE BOTTOM STEP AT THE SOUTHWEST ENTRANCE TO THE MUSEUM BUILDING, AND IN THE TOP OF A CONCRETE POST PROJECTING 8 INCHES ABOVE THE GROUND.

01 Jan 83 by NGS (GOOD)

RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1983 RECOVERED IN GOOD CONDITION. THE 1960 DESCRIPTION IS ADEQUATE WITH THE FOLLOWING EXCEPTION, THE MUSEUM BUILDING IS NOW THE HOARCE M. ALBRIGHT VISTOR CENTER.

01 Jan 87 by NGS (GOOD)

RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1987 RECOVERED IN GOOD CONDITION.

PY0160 "Y8 - 1923" - Benchmark detail.

PY0160 "Y8 - 1923" - Benchmark setting.  Set in a concrete post adjacent to the walkway to the Horace M. Albright Visitor Center.  View northerly.

PY0160 "Y8 - 1923" - Benchmark setting.  Set in a concrete post adjacent to the walkway to the Horace M. Albright Visitor Center.  View westerly.

PY0160 "Y8 - 1923" - Benchmark setting.  Set in a concrete post adjacent to the walkway to the Horace M. Albright Visitor Center.  View southerly.

PY0160 "Y8 - 1923" - Benchmark setting.  Set in a concrete post adjacent to the walkway to the Horace M. Albright Visitor Center.  View easterly.

PY0160 "Y8 - 1923" - Benchmark setting.  Set in a concrete post adjacent to the walkway to the Horace M. Albright Visitor Center.  View northerly.

PY0160 "Y8 - 1923" - Benchmark and GPSr with coordinates.

Control Text

• The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
• The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
• The geoid height was determined by GEOID99.
• The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (g = 980.6199 gals.).
• The modeled gravity was interpolated from observed gravity values.